Apparatus for cutting threads on tubes and for cutting off tubes



March Z4, 1925. f 1,530,686

v, MULLER I APPARATUS'FOR CUTTING THREADS ON TUBES AND FOR CUTTING OFF TUBES Nimm l n. g

4 g if l n r J ll lll 7 31a/vanto@ March 24,1925

. v. MULLER APPARATUS Fon CUTTING THREADS oN TUBEs AND Fon CUTTING oFF TUBEs File'd Nov. 8. 1921 2 Sheets-Sheet 2 i Menoz dar/M1161' n on l A Z/ l l//ll/ll//lWill/1111111111 Patented Mar. 24, 1925.

UNITED STATES PATENT. oFFicE.

VICTOR MLLER, OE PHILADELPHIA, PENNSYLVANIA, AssIGNOE OE ONE-HALE To JOHN srivnvIoNs COMPANY, or NEW YORK, N. Y., A CORPORATION OE NEW YORK.

APPARATUS FOB CUTTING THREADS ON TUBESk AND FOB CUTTING OFF TUBES.

Application filed November 8, 1921.

To all whom t may concern.'

Be it known that I, VICTOR MLLER, a citizen of the German Republic, and a resident of the city of Philadelphia, in the county of Philadelphia, in `the iStats of Pennsylvania, have invented certain new and useful Improvements in Apparatus for Cutting Threads on Tubesand for Cutting @ff Tubes, of which the following is a specification.

rlhe present invention relates to a combined threading and cutting Off machine for tubular bodies, and has for its purpose to provide Va machine of that character wherein the piece to be worked may be threaded on both ends at the same time and cut without removing the piece from its originally secured position, thereby considerably reducing the cost of manufacture of this material and-considerably expediting the time in which the work may be done, and wherein the cost of installment may be considerably reduced, because the apparatus can be easily attached on any present pipe lthreading machine, using hereby all the frame and driving and clamping parts of the same and scrapping only the old diehead, in whose place the object of the invention will be installed.

The apparatus forming the subject matter of this invention performs all these op'-v erations, that is, threading two ends of pipe at the same time and thereafter cutting oft' the finished piece, entirely automatically and thereafter stops the functioning of the apparatus, thus informing the operator when the stock or material has to be shifted and reclamped in the machine. These automatic. functions of my new apparatus enable the operator to attend a number of machines at the same time because his only service will be in removing and clamping the material stock. ,n

lith these advantages, the present invention embodies other points of merit, which will be set forth in the course of the following extended description and the appended claims.

Referring to the accompanying drawing wherein is shown the invention in its preferred embodiment:

Fig. 1 is a longitudinal sectional `view of the machine,v

Fig. 52l is a cross-sectional view on the line Serial No. 513,710.

Fig. 3, is a top plan view of the machine, Fig. i is a front elevation thereof,

Fig. 5 is a cross-sectional View, on the line of Fig; 1.

Fig. lo is an enlarged fragmentary secn tional view taken on line v6--6 of Fig. V1, showing the lead screw and ,cooperating plate for effecting the axial feeding ofthe tools, and

Fig. A7 is an enlarged fragmentary sectional view showing the cam-controlled clutch lever latch mechanism.

Referring to the several figures in detail, wherein like numerals of reference indicate corresponding parts of the different figures shown, the structure comprises a die-head 1, having cross-wise guideways, within which is mounted to move, tool-carrying toolholder 27 with a straight circular threading tool 28, toolholder 29 with a taper, circular threading tool 30, toolholder 31 with a taper circular threading tool 32 and toolholdcr 33 Awith a vcircular cutting off tool.

0n said die-head1 is rotatably mounted aA cylindrical tubular body 2, having mounted on the same a sp-urgear 3 and having further a number of adjustable setscrews 35 for the later described action on the threading tools, and having further a number of setscrews 36 for the later de scribed action in the cutting off tools.

A circular body 4 having a spurgear, is fastened on said die-head 1 and is provided with a slot 26 for a purpose, to be later set forth'.

With. said spurgear 3 on tubular body 2 is connected 'an idler gear 5, having clutch teethA 5a, and. also said spur-gear on the circular body 4 is connected with an idler gear 6, having clutch teeth 6a. Said idler gears 5 and @are rotatably mounted on a stud 7 which is fastened on headstock 22 of the machine. On said stud 7 is fastened a stop collar 8 with a stop shoulder 8a. A catch 9 slidably mounted on a clutch lever 10 presses against said collar 8 and holds the said clutch lever 10 with the gear 5 last in working position. A shaft 11 mounted rigidly with said clutch lever 10, is also con nected with a handlever 12 on which a spring 13 is connected, said'spring 13 at its other end is fastened to a stud 14, which is fastened on said headstock 22. A double pin 1G is slidably mounted in said tubular body 2, with its one end against said catch 9, Whileitsother endis guidingly pressed against .anumber of cams, y1a onsaid die-` head 1.

A cireular dise 15 With a number of cam notches-is Afastened-'nrsaid-'tubular 'body 2, said camfnotches actingf'on- --pfin 25 in af manner to he more fully set forth later.` An inner spindle 17 rigidly'eonne'cted Wrthtsaid" die-head 1, is provided witha collar 18 and. carries a spring 19, which presses with vone end.. against theV `Collar 18;'...Wh-ile. its yother end presses .against-.a ..00112111921, which is fastened :inside .of .a Yspinldlel20., .which 'carries in its cylindrical bore the aXially'slidea-hlef innerspindlel?. byimeansofa key and key# Way. .Said.headstoclrfspindlea is:rotat.y ablymounted in. headstocku22. of the maf. chine andreoeives -itsIO-tary Working motion hy any suitable power drive' attachment.

A lead sorew23., withA a threaded .part andl of the` samepitoh aszthe pipethread', to loe out is rigidlyV mounted on theheadstook 22.A of themaohine. A plate24 havinga .female threadlisrpressed .Vins the .threadedi part. off

said .lead vsorew`-f2{, and :is slideably Imountedl and heldrv inf guideways. of said cylindrical bodyfl. A pin..25..fastenedon said plate .24, is inserted..insaidslot opening 26,.an`dl is Y pressed vagainst .the Icam.. notches.. of 5 said Al numberI of springsf located in. .openings onzthev die-headr1ibea12 With-their.. onesend against the.4 bottom.. face` of .sai-dl open ings and.. Withf their .other` end.` againstshouls -dersoffsaid -toolholders .27., `29,314 and Aeo-ver plate fastened on saidA die-head.. 1 oovers-thefront fa'cesoffsaid toolholders., 27, .249, .31' and .33, thus holdii'igi.themfzinthe. guideways ofy die-head1, at .the same. time allowing... the toolholders.. 27.-,U 29, i317 and.. 33.. an easy movingtaotioni,... A elampingx.deviee. 39 of the.maohineiholds thepieoe 40, to.. be Worked, .inthe fdesired positions..

Assumingmow that a.. pipe.- 40.-hasbeen.: clamped in position for'working, andthe. headstook spindle 20` Withthe.attaohedfape paratus isrunning idle Witlilthertoolsre.- moved outside from .the pipestoek, .then ley.` operating the .handlc-iver.l 12. the Clutch .leverV 10 will. push nthe gear..toivardsthe'gear and the Clutch teeth 5 Willi engage thecluteh teeth-13% Tlierehyithef idlery gear. 6 driven f by the spurgeardwilll transmit itsrotating.4 motion upon the .idler .gearfand will. trans@ mit further the rotatable -movementto the spurgear 3 in .a ratio `accordingMto the diff. ference of thegears, butin thesamediiiving; direction as .thegearft on die-head: 1. When operating. the hand lever 12,.,the catch T9 and leve-r 10 Withl its stop shoulder Will rest. Y against the stopV shoulder` of stop eollar.8 and -Will hold the interconnected' idlergearsr- 5 and'v @inoperative position'to. each other. and thereby-give the tubular body 2 a greater .v

- advance rotatable. movement. uponl the diehead .1.. Thus... the?. cam-...notoha of .disc 15 moves awayfrom under. therpin i25fandf.' the female thread plate 24 Will by means of springs 241 be pressed in the threaded part position onthe headsteol'22jandfivillthereby move sidewise relative to the. die-head 1v4 in'ae'eordanceto the thread'p'itelr "and" in uniform .to the pitch. to be Worked on the pipe'stoek 40'. This also causes an axially sliding movement.. of. .the...in.ner. spindlell` inside the .-frotatingdieadstook.y spindle 20. .y

This greater.. advance movement. of .tubue lar..bodyf.2 .revolving-.on the now slowerk roe` tating ...dieeh'ead-.` 1 brings.l iirst'ftlief' short -setf screws 35..agai1nst.-..the' tooliholders,:,and.,V

presses. l.the same centerwards .downagainst.

the. pipestoelr410...l Tool'holderfi27., Withf'J its ing a number of vteeth withV the profilelofea... thread` of desirednpithzdand. also..` the.. tool#l holderfQQv and. 1.,.with4 their cylindrical .ta..

pering....threading tools;- 30.` andxSQare. .nowv guidedagainst the: pipestock. .40.- andrlcut a .thread on. the@ latter. .to a. .fraction of :the

thread i'. depthQ.. Then.. acts fthe straight..

threadoutter .28.1as a zroughingtool, .and lthe.4 taper` thread ncutters 30fandr82. as.v iinishQ-oi'. smoothing .,tools. and taper. Athe .l thread out.. surfaeeflineA according. to. the taper' of ltools y3() "andf132:

After ythe dies-head? 1 with. the threading.,

tools 1.28, 30, 32;.hasfm'ade a .number fofrrevof. lutlons around. therpipesto'k .40. the :first set-l toolholders 27.`,' 29,and. ,31;-andiithec springs?. 37, pressxthe :.ltools. off.' from...t-he. .pipestock Y 40. Atthesamelltime iafoammotoh. .of cylin..

drieal dise 15 vmoves undergthe.pin.125:-.andr4 li fts fthe. same. .with .the ...pla-te. 211; outwards andreleases the samelfrom theiengagement:

,ratus receives.. a` ..backward..movement:in..

aXialdirection;.insidethe. headstook V'spindle 20 ythus .moving y.the .inner spindle .17 of thea apparatus .maa baoltwaild .direction-Which is limitedhy the. colla-r 21; inside ofv headstook.

spindle @20; Tlieeontinued rotation of tuibu-f lar.J h0dy.2anld. .diesheadelagain. moves theV y cam .notoh'ofidise- 1 away fronn under the. pin`25, and thus allows the plateQALL-to slide4 hack. with. .its .female .threaded part. inf. eir-i threading' Atools in toolholders 27 ,my 294 anda! 31, y.bymeans of. the longer .setscrevv 35, .aref again .guided againstV the p1pestoek40. and

perform now a second and.deeperfoutfoffi thread..

The aforesaidoperations of nthe leadscre'w partsfareveaused. bythe :cam .notoh'esof dise:

15, and of the toolholders 27, 29,-'and-31`with gagement .with i the thij'eadedtifpart of ffsaid., 120 lead.. screw 23-and. again per forms .the 1 thread'.

leading...movement of fthe` apparatus.. The

iii

the threading tools. By means of the successively longer setscrews in body 2, and the repeated deeper cuts of thread, finally brings the thread on to work piece 4() to the desired finish. After this, the continued rotary movement of tubular body 2 and diehead 1 brings a sufficient release of the lead-screw parts thus keeping the inner spindle 17 with the apparatus in the rear position for a. length of time, sulicient ,for the necessary operation of cutting the piece in the desired length.

rllhis will be accomplished by still continu ing rotation of tubular body 2 and die-head 1, whereby set-screw 36 bearing against the outer end face of toolholder 33, which toolholder with its cutting ofil tool 34 is guided against the piece 40 to be worked. Thus the cutting od tool 34 severs the finished piece 40 from the pipestock, after which the double pin 1G, by means of cam 1all on diehead 1 is pressed against the catch 9 and moves the same downwards, thereby releasing the same from the stop-shoulder 8'rl of stop collar 8. This movement allows the heretofore compressed spring 13 to become effective moving the handlever 12, whereby the clutch lever 10 disengages the gears and (i, by removing the clutch teeth 5n out of clutch teeth 6, Continued rotation of tubular body 2 on die-head 1 is now stopped until handlever 12 is again actuated to start the operation of the apparatus for working on the next work piece 40.

For the purpose of guiding the thread ing tools in continued outward or inward movements according to tapered thread, the toolholders 29 and 31 are each provided with a tapered outside face, on which the set screws 35 are guided thus reducing or enlarging the distance of the threading tools 3() and 32 from the surface of the piece 40, and accomplishing thereby a perfect and smooth tapering thread.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is:

1. ln a threading and shearing device, a revoluble axially movable die-head, in combination with a set of threading tools, said threading tools having teeth for cutting a number of threads at once, and a shearing tool, said shearing tool having a tooth for cutting oli the threaded piece to be worked, all of said threading and shearing tools being fastened in toolholders, secured to said die-head and simultaneously partaking of the several movements of said die-head and means successively engaging said tool holders for radially actuating the same.

2. ln a threading and shearing device, a revoluble axially movable die-head in combination with a set of threading tools and a shearing tool, said threading tools having teeth for cutting a number of threads at once, said shearing tool having a tooth for cutting off the threaded piece to be worked, toolholders for said threading and shearing tools, said toolholders being secured to said die-head and simultaneously partaking of the several movements of said die-head, said toolholders being radially displaceable by springs and set screws of different lengths for the threading tools, said threading tools having tapered end faces for making a conical thread, said toolholders being radially displaceable by springs and a set screw for the shearing tool, said shearing tool having a tapered end face for the inward movement thereof.

3. ln a threading and shearing device a revoluble' axially movable die-head in comy bination with a set of threading tools and a shearing tool, said threading tools having teeth for cutting a number of threads at once, said shearing tool having a tooth for cutting off the threaded piece to be worked, all said threading and shearing tools being secured to said die-head and simultaneously partakingof the several movements of said die-head, a tubular body having a plurality of set screws, for radially displacing said threading and shearing tools, said tubular body being revoluble on said die-head and adapted to receive an advancing movement by means of gears of different ratio.

4. ln a threading and shearing device a revoluble axially movable die-head in combination with a lead screw device, fastened on a headstock of said device, a female screw plate engaging said lead screw, said engagement being timed and actuated by means of a set of cam notches, and a spring and stop collar for regulating the back slide motion of said die-head` 5. ln a threading and shearing device a revoluble axially movable die-head in combination with a tubular body and lead screw device for actuating threading and shearing tools carried by said die head, a double pin, cams, a catch, a stop-collar formed with a stop shoulder, and a clutch lever and a hand lever therefor provided with a spring for automatically stopping the die-head operation.

VICTOR MULLER. 

